Scattering by a Body in a Random Medium

摘要

Scattering by a body in a random medium is considered to consist of two issues. The first issue is SPC wave scattering and the second is statistical coupling between incident and scattered waves. By a method using a current generator and Green's function, we have expressed scattered waves by conducting cylinders in random media and evaluated the RCS of cylinder with the concave-convex cross-section. Numerical results show clearly that the SCL of incident wave around the cylinder plays a central role in the behavior of the RCS. For the case of SCL the cylinder size ka, the bistatic RCS normalized to that in free space is independent of the cylinder configuration and the polarization of incident wave. This means that only the second issue characterizes the RCS. When the random medium parameters: intensity, scale-size and thickness change, we obtain interesting characteristics of the RCS. On the other hand, for the case of SCL ～ ka and SCL < ka, the RCS is closely related to both issues. Under a fixed second issue, we show that the monostatic RCS changes complicatedly with the cylinder configuration and the polarization and incident direction of incident waves. This change is due to the first issue.